diff --git a/salem/gis.py b/salem/gis.py
index 27ff56d..e7b077e 100644
--- a/salem/gis.py
+++ b/salem/gis.py
@@ -17,6 +17,7 @@
 
 try:
     from osgeo import osr
+    osr.UseExceptions()
     has_gdal = True
 except ImportError:
     has_gdal = False
@@ -1259,7 +1260,6 @@ def proj_is_same(p1, p2):
     """
     if has_gdal:
         # this is more robust, but gdal is a pain
-        osr.UseExceptions()
         s1 = osr.SpatialReference()
         s1.ImportFromProj4(p1.srs)
         s2 = osr.SpatialReference()
@@ -1275,7 +1275,11 @@ def proj_is_same(p1, p2):
 def _transform_internal(p1, p2, x, y, **kwargs):
     if hasattr(pyproj, 'Transformer'):
         trf = pyproj.Transformer.from_proj(p1, p2, **kwargs)
-        return trf.transform(x, y)
+        with warnings.catch_warnings():
+            # https://github.com/pyproj4/pyproj/issues/1415
+            warnings.filterwarnings("ignore", category=DeprecationWarning,
+                                    message=".*ndim > 0 to a scalar.*")
+            return trf.transform(x, y)
     else:
         return pyproj.transform(p1, p2, x, y, **kwargs)
 
@@ -1397,9 +1401,9 @@ def transform_geopandas(gdf, from_crs=None, to_crs=wgs84, inplace=False):
         to_crs = to_crs.srs
     elif isinstance(to_crs, Grid):
         to_crs = None
-    result.crs = to_crs
+    result.set_crs(to_crs, allow_override=True, inplace=True)
     out.geometry = result
-    out.crs = to_crs
+    out.set_crs(to_crs, allow_override=True, inplace=True)
     out['min_x'] = [g.bounds[0] for g in out.geometry]
     out['max_x'] = [g.bounds[2] for g in out.geometry]
     out['min_y'] = [g.bounds[1] for g in out.geometry]
@@ -1441,7 +1445,6 @@ def proj_to_cartopy(proj):
     srs = proj.srs
     if has_gdal:
         # this is more robust, as srs could be anything (espg, etc.)
-        from osgeo import osr
         s1 = osr.SpatialReference()
         s1.ImportFromProj4(proj.srs)
         if s1.ExportToProj4():
diff --git a/salem/tests/test_misc.py b/salem/tests/test_misc.py
index 0601009..0320a43 100644
--- a/salem/tests/test_misc.py
+++ b/salem/tests/test_misc.py
@@ -55,9 +55,8 @@ def create_dummy_shp(fname):
     i_line = shpg.LinearRing([(1.4, 1.4), (1.6, 1.4), (1.6, 1.6), (1.4, 1.6)])
     p1 = shpg.Polygon(e_line, [i_line])
     p2 = shpg.Polygon([(2.5, 1.3), (3., 1.8), (2.5, 2.3), (2, 1.8)])
-    df = gpd.GeoDataFrame()
+    df = gpd.GeoDataFrame(crs='EPSG:4326', geometry=gpd.GeoSeries([p1, p2]))
     df['name'] = ['Polygon', 'Line']
-    df.set_geometry(gpd.GeoSeries([p1, p2]), inplace=True)
     of = os.path.join(testdir, fname)
     df.to_file(of)
     return of